48e67d1d60
want the NO_ESTIMATE flag here, because if the source doesn't have it, rnd_add_data will *use the time the data was added directly as entropy*, which is not a good idea either for a hardware RNG that works like this one (periodically polled by the driver) or, really, like any other that I've seen, because even for "interrupt when ready" RNGs the data rate (and thus interrupt time) will vary only slightly for a given RNG configuration over time, if at all. The data we add _is_ counted into the pool estimage because we directly pass in an entropy estimate. The overloading of the NO_ESTIMATE flag with this meaning seems, to me, like a design bug (albeit easily fixed) in the rng interface; but until that's changed, we need to use it here.
204 lines
6.3 KiB
C
204 lines
6.3 KiB
C
/* $NetBSD: amdpm.c,v 1.7 2003/09/01 06:30:24 tls Exp $ */
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/*-
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* Copyright (c) 2002 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Enami Tsugutomo.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: amdpm.c,v 1.7 2003/09/01 06:30:24 tls Exp $");
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#include "opt_amdpm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <sys/callout.h>
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#include <sys/rnd.h>
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#include <dev/pci/pcivar.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcidevs.h>
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#include <dev/pci/amdpmreg.h>
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struct amdpm_softc {
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struct device sc_dev;
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pci_chipset_tag_t sc_pc;
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pcitag_t sc_tag;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh; /* PMxx space */
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struct callout sc_rnd_ch;
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rndsource_element_t sc_rnd_source;
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#ifdef AMDPM_RND_COUNTERS
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struct evcnt sc_rnd_hits;
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struct evcnt sc_rnd_miss;
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struct evcnt sc_rnd_data[256];
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#endif
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};
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int amdpm_match(struct device *, struct cfdata *, void *);
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void amdpm_attach(struct device *, struct device *, void *);
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void amdpm_rnd_callout(void *);
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CFATTACH_DECL(amdpm, sizeof(struct amdpm_softc),
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amdpm_match, amdpm_attach, NULL, NULL);
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#ifdef AMDPM_RND_COUNTERS
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#define AMDPM_RNDCNT_INCR(ev) (ev)->ev_count++
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#else
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#define AMDPM_RNDCNT_INCR(ev) /* nothing */
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#endif
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int
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amdpm_match(struct device *parent, struct cfdata *match, void *aux)
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{
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struct pci_attach_args *pa = aux;
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if (PCI_VENDOR(pa->pa_id) == PCI_VENDOR_AMD &&
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PCI_PRODUCT(pa->pa_id) == PCI_PRODUCT_AMD_PBC768_PMC)
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return (1);
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return (0);
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}
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void
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amdpm_attach(struct device *parent, struct device *self, void *aux)
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{
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struct amdpm_softc *sc = (struct amdpm_softc *) self;
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struct pci_attach_args *pa = aux;
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pcireg_t reg;
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u_int32_t pmreg;
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int i;
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aprint_naive("\n");
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aprint_normal("\n");
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sc->sc_pc = pa->pa_pc;
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sc->sc_tag = pa->pa_tag;
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sc->sc_iot = pa->pa_iot;
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#if 0
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aprint_normal("%s: ", sc->sc_dev.dv_xname);
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pci_conf_print(pa->pa_pc, pa->pa_tag, NULL);
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#endif
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reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
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if ((reg & AMDPM_PMIOEN) == 0) {
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aprint_error("%s: PMxx space isn't enabled\n",
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sc->sc_dev.dv_xname);
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return;
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}
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reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_PMPTR);
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if (bus_space_map(sc->sc_iot, AMDPM_PMBASE(reg), AMDPM_PMSIZE,
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0, &sc->sc_ioh)) {
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aprint_error("%s: failed to map PMxx space\n",
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sc->sc_dev.dv_xname);
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return;
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}
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reg = pci_conf_read(pa->pa_pc, pa->pa_tag, AMDPM_CONFREG);
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if (reg & AMDPM_RNGEN) {
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/* Check to see if we can read data from the RNG. */
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(void) bus_space_read_4(sc->sc_iot, sc->sc_ioh,
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AMDPM_RNGDATA);
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for (i = 0; i < 1000; i++) {
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pmreg = bus_space_read_4(sc->sc_iot,
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sc->sc_ioh, AMDPM_RNGSTAT);
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if (pmreg & AMDPM_RNGDONE)
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break;
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delay(1);
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}
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if ((pmreg & AMDPM_RNGDONE) != 0) {
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aprint_normal("%s: "
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"random number generator enabled (apprx. %dms)\n",
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sc->sc_dev.dv_xname, i);
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callout_init(&sc->sc_rnd_ch);
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rnd_attach_source(&sc->sc_rnd_source,
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sc->sc_dev.dv_xname, RND_TYPE_RNG,
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/*
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* XXX Careful! The use of RND_FLAG_NO_ESTIMATE
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* XXX here is unobvious: we later feed raw bits
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* XXX into the "entropy pool" with rnd_add_data,
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* XXX explicitly supplying an entropy estimate.
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* XXX In this context, NO_ESTIMATE serves only
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* XXX to prevent rnd_add_data from trying to
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* XXX use the *time at which we added the data*
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* XXX as entropy, which is not a good idea since
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* XXX we add data periodically from a callout.
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*/
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RND_FLAG_NO_ESTIMATE);
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#ifdef AMDPM_RND_COUNTERS
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evcnt_attach_dynamic(&sc->sc_rnd_hits, EVCNT_TYPE_MISC,
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NULL, sc->sc_dev.dv_xname, "rnd hits");
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evcnt_attach_dynamic(&sc->sc_rnd_miss, EVCNT_TYPE_MISC,
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NULL, sc->sc_dev.dv_xname, "rnd miss");
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for (i = 0; i < 256; i++) {
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evcnt_attach_dynamic(&sc->sc_rnd_data[i],
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EVCNT_TYPE_MISC, NULL, sc->sc_dev.dv_xname,
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"rnd data");
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}
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#endif
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amdpm_rnd_callout(sc);
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}
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}
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}
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void
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amdpm_rnd_callout(void *v)
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{
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struct amdpm_softc *sc = v;
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u_int32_t reg;
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#ifdef AMDPM_RND_COUNTERS
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int i;
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#endif
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if ((bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGSTAT) &
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AMDPM_RNGDONE) != 0) {
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reg = bus_space_read_4(sc->sc_iot, sc->sc_ioh, AMDPM_RNGDATA);
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rnd_add_data(&sc->sc_rnd_source, ®,
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sizeof(reg), sizeof(reg) * NBBY);
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#ifdef AMDPM_RND_COUNTERS
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_hits);
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for (i = 0; i < sizeof(reg); i++, reg >>= NBBY)
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_data[reg & 0xff]);
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#endif
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} else
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AMDPM_RNDCNT_INCR(&sc->sc_rnd_miss);
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callout_reset(&sc->sc_rnd_ch, 1, amdpm_rnd_callout, sc);
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}
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